石油实验地质2026，Vol.48Issue(2)：348-364,17.DOI:10.11781/sysydz2026020348
弧后盆地控凹断层带反转作用与油气差异聚集的耦合效应
Coupling effect between tectonic inversion of sag-controlling fault zone and differential hydrocarbon accumulation in back-arc basin:
摘要
Abstract
The Pinghu Oil and Gas Field,as a core area for reserve increase and production enhancement in the East China Sea Basin,has important strategic significance for ensuring China's energy security.Significant differences in hydrocarbon enrichment layers and accumulation scales exist among different reservoirs in this oil and gas field,but the key factors controlling this differential hydrocarbon accumulation and distribution are still unclear.Utilizing newly acquired 3D high-resolution seismic,drilling,and logging data,the study systematically analyzed fault types and combinations,the superposition and evolution process of tectonic inversion and exten-sional structures,and the main controlling factors of hydrocarbon accumulation.Furthermore,it investigated the controlling mechanism of tectonic stratification and zonation on differential hydrocarbon accumulation.The results showed that the class Ⅰ sag-controlling fault and class Ⅲ associated faults together formed the Pinghu boundary fault zone,and multiple class Ⅱ plate-like faults formed the Pinghu fault-step structural zone.Tectonic inversion from the late Eocene to Miocene superimposed and compounded with the boundary fault zone,forming a series of bead-like faulted anticlines nearly parallel to the boundary faults.These faulted anticlines were small in scale and exhibited significant differences in hydrocarbon accumulation,with hydrocarbon enrichment mainly occurring in the middle and lower sections of the Eocene Pinghu Formation.The superposition of tectonic inversion onto the fault-step structural zone formed a dual-layer structure with faulted anticlines dominant in the lower part and anti-clines dominant in the upper part.Hydrocarbons were concentrated in the lower fault-fold structural layer.The anatomy of typical oil and gas reservoirs further revealed that the opening and sealing characteristics of faults were critical in controlling hydrocarbon accumulation.It is comprehensively concluded that the superposition of fault extension in the rift period and post-rift tectonic inversion alters the configuration of hydrocarbon accumulation elements,thereby controlling the migration,storage,and differential accumulation of hydrocarbon fluids.关键词
构造分带/反转构造/断层封闭/差异聚集/弧后盆地/平湖地区/东海盆地Key words
tectonic zonation/inversion structures/fault sealing/differential accumulation/back-arc basin/Pinghu area/East China Sea Basin分类
能源科技引用本文复制引用
段冬平,张朋,刘英辉,叶青,梅廉夫,何新建,夏振通,沈冠华,吕志欢..弧后盆地控凹断层带反转作用与油气差异聚集的耦合效应[J].石油实验地质,2026,48(2):348-364,17.基金项目
极地地质与海洋矿产教育部重点实验室及中国地质大学(北京)海南研究院联合开放基金(HNPY-202403)、中央高校基本科研业务费(2920240681)和中国海油项目(CCL2023SHPS003RS)联合资助. （北京）
